Basic Wordpress Post Type Creation

plugin.php

function create_post_type_eventos() {

    register_post_type( 'eventos',
        array(
            'labels' => array(
                'name' => __( 'Eventos' ),
                'singular_name' => __( 'Eventos' ),
                'all_items' => __('Todos los eventos'),
            ),
            'public' => true,
            'has_archive' => true,
            'rewrite' => true,
            'menu_icon' => 'dashicons-calendar',
            'menu_position' => 6,
            'supports' => array( 'title', 'excerpt', 'editor', 'thumbnail' )
        )
    );
    $set = get_option('post_type_rules_flased_eventos');
    if ($set !== true){
        flush_rewrite_rules(false);
        update_option('post_type_rules_flased_eventos',true);
    }
}

add_action( 'init', 'create_post_type_eventos' );

Dashicons Wordpress : https://developer.wordpress.org/resource/dashicons